Lag while typing posts on this forum

I've got a strange complaint and it may have started with Yosemite. But when I type up a post like this or reply to one, I often get really noticeable lag when I'm typing such that I can get several keystrokes ahead of whats appearing on the screen. I wonder if theres's some strange bug in Safari and the way it interacts with the forum software... am I alone or has anyone else noticed this?

It happened at least 4 or 5 times while typing this up... about once per line. It's extremely annoying.

It does not happen in Evernote or Word so it's not my system or my keyboard or anything.

I have a nMP 6-core with 32GB of RAM BT Apple keyboard and nothing but the usual apps.

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